diff --git a/common/tools.py b/common/tools.py
index 4a89c47..b7988cb 100644
--- a/common/tools.py
+++ b/common/tools.py
@@ -50,10 +50,13 @@ def sed_i(file_path, pattern, subst):
 	from tempfile import mkstemp
 	from shutil import move
 	from os import close
+	import os
 	temp_fd, temp_path = mkstemp()
+	mode = os.stat(file_path).st_mode
 	with open(temp_path, 'w') as new_file:
 		with open(file_path) as old_file:
 			for line in old_file:
 				new_file.write(line.replace(pattern, subst))
 	close(temp_fd)
+	os.chmod(temp_path, mode)
 	move(temp_path, file_path)